java 17 spirepdf version 11.3.5
I have problems flattening a pdf document containing multiple PdfRadioButtonListItem
Check this code, based on your example at https://github.com/eiceblue/Spire.PDF-f ... World.java
- Code: Select all
public static void main(String[] args) throws Exception{
PdfDocument doc = new PdfDocument();
//Create one page
PdfPageBase page = doc.getPages().add();
//Create font
PdfFont font = new PdfFont(PdfFontFamily.Times_Roman, 12f, EnumSet.of(PdfFontStyle.Regular));
//Create a pdf brush
PdfBrush brush = PdfBrushes.getBlack();
float x = 80;
float y = 350;
float tempX = 0;
//Create a pdf radio button field
PdfRadioButtonListField radioButton = new PdfRadioButtonListField(page, "RadioButton");
radioButton.setRequired(true);
//Add items into radio button list
for (int i = 0; i < 2; i ++)
{
PdfRadioButtonListItem fieldItem = new PdfRadioButtonListItem();
fieldItem.setBorderWidth(0.75f);
fieldItem.setBounds(new Rectangle2D.Float(x, y, 15, 15));
radioButton.getItems().add(fieldItem);
tempX = x + 20;
page.getCanvas().drawString("Item" + i, font, brush, tempX, y);
x = tempX + 100;
}
//Add in form
doc.getForm().getFields().add(radioButton);
String output="result.pdf";
doc.saveToFile(output);
doc.close();
PdfDocument doc1 = new PdfDocument();
doc1.loadFromFile("result.pdf");
doc1.getForm().isFlatten(true);
doc1.saveToFile("result-flatten.pdf");
}
The last saveToFile after the flatting causes this error:
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Exception in thread "main" java.lang.NullPointerException: Cannot invoke "com.spire.pdf.PdfPageBase.spr┃∭()" because the return value of "com.spire.pdf.fields.PdfField.getPage()" is null
at com.spire.pdf.widget.PdfFormWidget.spr▔∭(Unknown Source)
at com.spire.pdf.widget.PdfFormWidget.spr╕∮(Unknown Source)
at com.spire.pdf.widget.PdfFormFieldWidgetCollection.spr┭∭(Unknown Source)
at com.spire.pdf.fields.PdfFieldCollection.remove(Unknown Source)
at com.spire.pdf.widget.PdfFormWidget.spr┟∬(Unknown Source)
at com.spire.pdf.packages.spraee.spr╸∮(Unknown Source)
at com.spire.pdf.packages.spryuo.spr╸∮(Unknown Source)
at com.spire.pdf.packages.sprpye.spr┙⌭(Unknown Source)
at com.spire.pdf.packages.sprpye.spr‣⌮(Unknown Source)
at com.spire.pdf.packages.sprmlo.spr“╽(Unknown Source)
at com.spire.pdf.packages.sprmlo.spr®╽(Unknown Source)
at com.spire.pdf.packages.sprmlo.spr”╽(Unknown Source)
at com.spire.pdf.packages.sprmlo.spr┹╼(Unknown Source)
at com.spire.pdf.packages.spradp.spr▓§(Unknown Source)
at com.spire.pdf.PdfDocumentBase.save(Unknown Source)
at com.spire.pdf.PdfDocument.saveToFile(Unknown Source)
